JP3121658U - Crack-induced water stop structure - Google Patents

Abstract

[Problem] To provide a crack-induced water-stopping structure for a concrete frame that prevents cracks from occurring in other places by properly generating cracks only in the pre-established concrete frame and effectively stops water. To do.
A crack-inducing water-stopping structure for a concrete structure including a reinforcing bar and a crack-inducing water-stopping member, wherein a hole for injecting a water-stopping agent is formed in the crack-inducing water-stopping member. An opening that communicates with the outside, and all the surfaces other than the opening are covered with a coating layer of an adhesive material that has excellent adhesion to concrete, and the opening is water-stopping. A crack-induced water stop structure that is placed near the reinforcing bar inside the concrete frame that is covered with paper that allows the agent to permeate but uncured concrete does not.
[Selection] Figure 8

Description

  The present invention is a crack-induced water-stopping structure for a concrete frame that prevents cracks from occurring in other places by properly generating cracks only in the locations assumed in advance in the concrete frame after placing, and effectively stops water, The present invention also relates to a crack-inducing water stop member used therefor.

  Cracks due to hardening shrinkage of the placed concrete are inevitable on the surface of the reinforced concrete structure, but if these cracks occur in any number of locations, not only will the appearance be impaired, but corrosion of the internal rebar due to moisture intrusion will occur.・ It may lead to deterioration and decrease in strength of the chassis. In order to prevent these, a crack-inducing joint or structure is formed at a specific location in the concrete frame to make the cross-sectional shape different from that of other parts. Conventionally, a method for preventing many cracks from occurring randomly and facilitating waterproofing work against the crack has been employed.

  Of the crack-inducing joints and structures that actively generate cracks in a state that is appropriately managed in such pre-estimated locations, conventional crack-inducing members that are embedded in the concrete together with reinforcing bars are used to induce cracks. As an example of the crack inducing structure, there is one described in Patent Document 1, which is shown in FIGS. FIG. 12 is a schematic cross-sectional view of the construction state of the conventional crack inducing structure, and FIG. 13 is a schematic cross-sectional view of the crack inducing state.

  The crack inducing member 100 used in the conventional crack inducing structure in FIG. 12 is a bowl-shaped body having a substantially U-shaped cross section sandwiching a gap serving as a drainage channel 110, and opposed pieces 101 having a predetermined length are provided at both ends of the opening. The portion surrounding the drainage channel 110 and the outside of the opposing piece 101 are covered with a water stop material 102 made of a predetermined elastic material excellent in durability, crack resistance and the like, and further, the outer main portion is covered. It is the structure covered with the other water stop material 103 with good adhesiveness with concrete.

  The process of attaching the conventional crack inducing member to the reinforcing bar and causing the crack will be described. First, after arranging the wall bars 120, the crack inducing member 100 is fixed to the wall bars 120 while arranging the drainage channels 110 so that the openings of the drainage channels 110 face outward. On the other hand, a notch forming member 131 such as an L-shaped cross-section member is attached to the mold 130, and its tip protrudes inward from the mold 130. After this, concrete is placed in the mold 130, but there is no inflow of concrete into the gap between the opposing pieces 101 in the crack inducing member 100. If the formwork 130 is disassembled after the concrete is hardened and the notch forming member 131 is removed, a notch is formed by the notch forming member 131 on the front side of the concrete 200, and the crack inducing member 100 is embedded in the concrete 200. It is done.

  When the concrete 200 is cured and shrunk, the concrete thickness on the front side of the gap portion between the opposing pieces 101 is thin, so that a crack 202 is induced from the notch 201 on the outer side. As a result, the crack 202 and the drainage channel 110 are in communication with each other. When water such as rainwater enters the crack 202, the water flows into the drainage channel 110 through the gap between the opposing pieces 101, falls, and drops into a pipe provided on a horizontal joint on the first floor of the building, for example. It flows and drains to the outside. The periphery of the crack inducing member 100 is covered with the water-stopping materials 102 and 103 except for the openings, so that the water from the crack 202 can be prevented from flowing to other than the drainage channel 110.

  In addition, another example of the conventional crack inducing structure is described in Patent Document 2, which is shown in FIG. FIG. 14 is a schematic cross-sectional view of another conventional crack inducing structure.

  In FIG. 14, the crack inducing member 300 used in another conventional crack inducing structure includes a projecting portion 301a projecting in a chevron shape having a triangular cross section, and a flat flange portion 301b extending on both sides of the projecting portion 301a. The protruding portion 301a is formed in the groove 410 between the groove 410 provided on the surface of the concrete structure 400 and the structural reinforcing bar 420. The core material 301 and the adhesive layer 302 made of a polymer material are provided. It is arranged while facing each other.

  In the other conventional crack inducing structure, first, the crack inducing member 300 is fixed to the structural reinforcing bar 420 while being arranged so that the protruding portion 301a faces outward from the structure. If necessary, the inner crack inducing member 310 is disposed inside the structural reinforcing bar 420. Thereafter, concrete is placed in a mold surrounding the structural reinforcing bar 420 and the crack inducing member 300, and the crack inducing member 300 is embedded in the structure 400 by hardening the concrete. On the other hand, a groove 410 is formed on the front side of the structure 400 by a member that protrudes inward at a part of the mold.

  When the concrete is cured and contracted, a crack is generated between the groove 410 and the protruding portion 301 a of the crack inducing member 300. Even if the outside air and water enter from the crack, the adhesive layer 302 of the crack inducing member 300 is in close contact with the concrete, the outside air and water are blocked at the interface between the adhesive layer 302 and the concrete, and the structural reinforcing bar 420 is formed. Not exposed to open air and water.

JP 11-264200 A Japanese Patent No. 2868994

  Since the conventional crack inducing structure is configured as described above, in the case of the former former described in Patent Document 1, a drainage facility for draining water that has entered the crack 200 to the outside is required. Since such equipment is embedded in the concrete frame, maintenance is difficult, and not only is there a high risk of water leakage or the like when the equipment deteriorates, but water flows along the crack inducing member 100. Since the deterioration of the crack inducing member 100 due to water progresses, when the crack inducing member 100 eventually breaks, it becomes impossible to prevent the water from reaching the reinforcing bar and avoid the decrease in the strength of the frame accompanying the deterioration of the reinforcing bar. It had the problem that it was not possible.

  In addition, if the drainage channel is excessively continuous in the height direction, the drainage capacity is saturated on the lower side and there is a risk of water leaking to the outside through the crack 200. Therefore, it is necessary to provide a drainage facility for each predetermined height. Has occurred, leading to an increase in cost.

  By the way, in general, when an object other than concrete occupies about 30% of the total thickness of the concrete frame, it is known that cracks preferentially occur in that part. External cracks between the outer walls in Patent Documents 1 and 2 occur due to this phenomenon. On the other hand, as for the internal crack generated in the concrete, when the thickness is relatively thin (for example, up to 45 cm), the crack is preferentially generated in the portion where the crack inducing member is disposed. When the thickness becomes thicker, it becomes impossible to appropriately generate cracks at the initially assumed location, and it becomes impossible to properly stop the water inside the structure with irregularly generated cracks.

  In the lower part of the rebar that was placed sideways, a void was created by shrinkage caused by the hardening of the concrete, and this void became a passage for water to promote corrosion of the rebar, and also circulate water throughout the concrete structure. It is supposed to be.

  In the case of the construction method described in Patent Document 2, water stoppage on the surface side of the structure 400 is possible with the surface pressure-sensitive adhesive layer of the crack inducing member 300, but the inside generated inside the reinforcing bar by the inner crack inducing member 310 The cracks are left as voids, and effective countermeasures are not taken for the voids in the lower part of the reinforcing bars, which are water passages, and further improvement is necessary in terms of water stoppage of the entire concrete structure. .

  The present invention solves these problems, and can appropriately induce external and internal cracks and properly stop water, preventing the water from reaching the reinforcing bars from both inside and outside, and strengthening the concrete structure. An object of the present invention is to provide a crack-induced water-stopping structure and a crack-induced water-stopping member that can surely prevent a decrease and can be constructed at low cost.

That is, the present invention is a crack-induced water stop structure of a concrete structure including a reinforcing bar and a crack-induced water stop member,
The crack-inducing water-stopping member is a long member having a T-shaped cross section, and a hole for injecting a water-stopping agent penetrating in the longitudinal direction of the long member is formed at the base of the T-shaped convex portion. 1 or 2 or more openings that communicate with the hole and the outside are provided on a flat surface that forms at least the T-shaped flat portion, and at least all surfaces other than the openings of the flat surface are made of concrete. It is a member covered with a coating layer of an adhesive material that is excellent in adhesion with
The opening is covered with paper that allows the water-stopper to penetrate but uncured concrete does not.
The crack-inducing water-stopping member relates to a crack-inducing water-stopping structure in which a convex portion of the member is arranged in the vicinity of a reinforcing bar inside the concrete housing so that the convex portion faces the outer surface of the concrete housing.

In addition, the present invention creates internal cracks in the interior surrounded by external cracks and reinforcing bars between the specified points on the outer surface of the concrete frame as the concrete hardens, and the reinforcing bars inside the concrete frame to stop water. A crack-inducing water-stopping member disposed in the vicinity,
It is a long member having a T-shaped cross section, and a hole for injecting a water-stopping agent penetrating in the longitudinal direction of the long member is formed in the base of the convex portion of the T-shaped, and at least the T-shaped 1 or 2 or more openings that communicate the hole and the outside are provided on a flat surface that forms a flat part of the material, and at least all surfaces other than the openings of the flat surface are excellent in adhesiveness to concrete It also relates to a crack-inducing water-stopping member that is covered with a covering layer of material and whose opening is covered with paper that is permeable to water-stopping agent but not uncured concrete.

Such a structure and member of the present invention has a structure in which a crack-inducing water-stopping member is disposed in the vicinity of a reinforcing bar inside a concrete frame, and then concrete is placed. In the crack-induced water stop construction method, an internal crack starting from a crack-induced water-stopping member is generated in the interior surrounded by external cracks and reinforcing bars between the points,
The crack-inducing water-stopping member is a long member having a T-shaped cross section, and a hole penetrating in the longitudinal direction of the long member is formed in the base of the convex portion of the T-shaped, One or two or more openings that communicate the hole and the outside are provided on a flat surface that forms a T-shaped flat portion, and at least all surfaces other than the openings of the flat surface are excellent in adhesion to concrete. A member covered with a coating layer of adhesive material,
The crack-inducing water stop member is disposed in the vicinity of the reinforcing bar inside the concrete frame so that the convex part of the member faces the outer surface direction of the concrete frame,
While holding the crack-inducing water-stopping member and the outside of the concrete frame in a communicable state, placing concrete,
Harden the concrete,
The present invention can be suitably applied to a crack-induced water-stopping method characterized by injecting a liquid water-stopping agent from the outside of a concrete frame into a hole of a crack-induced water-stopping member and filling the water-stopping agent into an internal crack through an opening.

  By adopting the structure and member of the present invention, the crack-inducing water-stopping member prevents water from entering from the external crack intentionally induced between the outer surface (outer wall) of the concrete frame and the crack-inducing water-stopping member. It is possible to prevent water from reaching the rebar by blocking it with an adhesive coating layer provided on the surface in the outer wall direction of the inner wall, and to generate an internal crack (rebar) In addition to internal cracks, the inside surrounded by cracks also includes cracks generated between the crack-inducing water-stopping member and the reinforcing bar), and also in the voids formed under the horizontal reinforcing bars By filling the water sealant injected into the hole of the water member and released from the opening, it is possible to reliably achieve cracks inside the concrete frame and water stop near the reinforcing bars. That. As a result, the strength of the entire concrete structure can be maintained for a long time.

  In the structure and member of the present invention, the diameter of the hole is enlarged at one end in the longitudinal direction of the crack-inducing water stop member, and an annular protrusion that can be inserted into the enlarged hole is provided at the other end. It is preferable to be provided.

  By configuring the end portion of the crack-inducing water-stopping member in this way, it becomes easy to connect a hole for injecting the water-stopping agent and a pipe for communication between the outside of the concrete frame and the like, and the filling and filling work of the water-stopping agent is easy become. In addition, by fitting the portion with the enlarged hole diameter with the annular protrusion, it is possible to connect the crack-inducing water-stopping members while maintaining the communication state of the holes. It can be stored and arranged easily, and a water-stopping agent can be injected and filled to every corner of the internal crack induced in the concrete frame after hardening.

  In the structure and member of the present invention, the opening of the crack-inducing water-stopping member is preferably one or more slits or one or more small holes.

  By making the opening for injecting and filling the water-stopping agent into the internal crack into a slit or a vertically long hole, the water-stopping agent can flow out of the member uniformly over a wide range in the longitudinal direction of the induced water-stopping member. It is possible to ensure filling and sealing to the internal crack. Further, the cross-sectional shape of the crack-inducing water-stopping member can be made almost constant over the entire length of the member, so that the strength can be improved and the structure can be simplified. For example, when the slit is opened at both ends, the induced water-stopping member can be extruded, and it is easy to manufacture and cost reduction can be realized.

  In the structure and member of the present invention, the opening is covered with paper (tape-like paper) that allows the water-stopping agent to pass through but does not pass through uncured concrete.

  Covering the openings (slits, small holes, etc.) with paper with the above characteristics prevents intrusion of uncured concrete into the holes, and a water-stopper can be easily injected into the holes after the concrete is placed. And after the concrete has hardened, the internal cracks can be filled with water-stopper through the openings and paper.

  In the structure of the present invention, it is preferable to arrange an internal crack inducing body in parallel with the crack inducing water-stopping member in the central portion of the concrete frame surrounded by the reinforcing bars before placing the concrete.

  A wide concrete structure in which it is difficult to induce effective internal cracks only with a crack-inducing water-stopping member by arranging the internal crack-inducing body in the central part of the interior of the concrete frame surrounded by reinforcing bars. Even in this case, an internal crack can be intentionally induced between the internal crack-inducing body and the crack-inducing water-stopping member, and the internal crack can be effectively sealed and stopped by filling the water-stopping material from the crack-inducing water-stopping member. I can water.

  In the structure of the present invention, an internal crack inducing body promoting body is placed in parallel with the crack inducing water stopping member before placing the concrete at a position facing the crack inducing water stopping member inside the concrete frame surrounded by reinforcing bars. It is preferable to arrange.

  Such an internal crack inducing body promoter has the same effect as the inner crack inducing member described in Patent Document 2, and can effectively generate an internal crack starting from the crack inducing water stop member, The internal crack can be effectively sealed and water-stopped by filling the water-stopping material from the crack-induced water-stopping member. This internal crack inducer promoter may be used in combination with the internal crack inducer.

  Next, embodiments of the present invention will be described with reference to the drawings. However, the present invention is not limited to such embodiments, and includes modifications and changes obvious to those skilled in the art.

  FIG. 1 is a schematic cross-sectional view of an embodiment of the present invention during construction of a crack-inducing water-stopping member, and FIGS. 2 and 3 are a schematic perspective view and a partially omitted rear view of the crack-inducing water-stopping member, respectively. .

  In this embodiment, reference numeral 1 denotes a crack-inducing water-stop member, which is a long member having a substantially T-shaped cross section (see FIGS. 1 to 3). The crack-inducing water-stopping member 1 is preferably made of a metal such as aluminum or a synthetic resin such as polyvinyl chloride from the viewpoint of weight reduction and ease of manufacture.

  The crack induction water stop member 1 will be described with reference to FIG. In FIG. 1, the upper side of the drawing is the direction of the outer wall surface of the concrete frame, and the lower side of the drawing is the direction of the reinforcing bar (see FIG. 7).

  The crack-inducing water-stopping member 1 includes the T-shaped convex part 2 and the T-shaped flat part 3, and is used for injecting a water-stopping agent that penetrates the base of the convex part 2 in the longitudinal direction of the long member. A hole 4 is formed. Further, one or two or more openings 6 are provided on the flat surface 5 forming the flat portion 3 so as to communicate the hole 4 with the outside, and at least other than the openings 6 of the flat surface 5 in which the holes 4 are provided. The entire surface is covered with an adhesive material having excellent adhesion to concrete, for example, a coating layer 7 such as butyl rubber.

  As shown in FIGS. 1 and 3, it is possible to cover the opening 6 of the crack-inducing water-stopping member 1 with paper 8 that allows water-stopping agent to pass through but does not pass through uncured concrete. The concrete can be prevented from flowing into the hole 4, and as a result, after the concrete has hardened, a water-stopping agent (not shown) is injected and filled from the hole 4 into the concrete frame through the opening 6. can do. Although the use of a mesh sheet or the like can be considered instead of paper, paper is superior in terms of cost and workability in field construction.

  As a method of preventing the intrusion of the uncured concrete into the holes 4, in addition to the method of using paper, a method of narrowing the slit-shaped opening 6 by applying pressure to both sides of the slit-shaped opening 6, It may be used in combination with a method of blocking and leaving.

  Further, the end portion of the crack-inducing water-stopping member 1 of the hole 4 may be enlarged to form a recess 9 (see FIGS. 2 and 3). The recess 9 is useful when connecting a pipe (not shown) for injecting a water-stopping agent into the hole 4.

  Furthermore, as shown in FIG. 4 which is a schematic partial perspective view and FIG. 5 which is a schematic partial rear view, the end of the hole 4 of the crack-inducing water-stopping member is annularly protruded. The unit 10 may be used. Further, when one end of the hole 4 of the crack-inducing water-stopping member is a recess 9 and the other end is an annular protrusion 10 that can be inserted into the recess 9, the recess of one crack-inducing water-stopping member 1 is used. 9 and an annular protrusion 10 of another crack-inducing water-stopping member 1 can be fitted and integrated, and can be applied to a large concrete structure. In addition, the size of the crack-inducing water-stopping member 1 can be shortened, storage and disposition work can be facilitated, and the communication state of the holes 4 can be maintained, so that a water-stopping agent can be applied to every corner of the crack inside the concrete frame after hardening. Can be injected and filled.

  As shown in FIGS. 1, 3, and 5, the opening 6 may be a single slit or may be divided into a plurality of slits. Moreover, an ellipse may be sufficient and it is good also as the small hole 11 as shown in FIG. The shape of these openings may be appropriately selected depending on the water-stopping agent to be used, the length to be disposed, and the like. In addition, when making the opening part 6 into one slit with both ends opened, it is possible to extrude the crack-inducing water-stopping member 1, and it is easy to manufacture and can realize cost reduction.

  The adhesive coating layer 7 prevents water entering from external cracks from reaching the reinforcing bars of the concrete frame, and may be any material that has good adhesion to concrete. Preferably, butyl rubber can be used, but is not limited thereto. In order to further ensure the intrusion of water from the external crack, the covering layer 7 is provided on at least the entire surface other than the opening 6 of the flat surface 5 in which the hole 4 is provided.

  The covering layer 7 plays a role of blocking water entering from the outside of the concrete frame at the position of the member 1, and it is usually considered sufficient to cover a surface other than the flat surface 5. However, if the flat surface 5 is not provided with a coating layer of an adhesive material having good adhesion to concrete, the adhesion to the concrete is impaired at that portion, and a gap is left between the member 1 and the concrete as it hardens. It will end up as a path for water. Therefore, in the present invention, it is particularly preferable to cover all the member surfaces other than the opening 6.

  Next, an embodiment of the construction method will be described with reference to FIGS. FIG. 7 is a schematic cross-sectional view of an uncured state when concrete is laid on the structure of the present invention according to the method of the present invention, and FIG. 8 is a schematic cross-sectional view of the cured concrete frame of FIG. is there.

  The crack-inducing water-stopping member 1 of the present invention is arranged and fixed with a wire or the like on the reinforcing bar 30 with the convex portion 2 facing the outer wall surface of the concrete housing 40. Fixing to the reinforcing bar 30 may be performed directly or via a mounting member 31 such as a short reinforcing bar. However, it is important to fix the opening 6 so as not to be blocked.

  Normally, the reinforcing bars 30 are assembled on both sides of the concrete frame 40. In this case, as shown in FIG. 7, the crack-inducing water-stopping member 1 faces the reinforcing bars on each side so that the flat portion 5 faces each other. It is preferable to place them facing each other from the viewpoint of inducing the generation of the internal crack 42 (FIG. 8).

  Further, when the concrete frame is thick (for example, when the thickness exceeds 45 cm), in order to generate the internal crack 42 at a target position, the internal crack inducing body 20 is a part of the concrete frame 40 surrounded by the reinforcing bars. It is preferable to arrange on the line connecting the crack-inducing water stop members 1 on both sides at the center. The internal crack inducing body 20 has a length approximately the same as that of the crack inducing water stop member 1. The shape of the internal crack inducing body 20 is not particularly limited, but may be, for example, a round bar or a rectangular pipe, a round bar, or a square. For example, a tube made of polyvinyl chloride is preferable. The internal crack inducing body 20 may be installed only to temporarily fix the reinforcing bar 30 partially. In addition, it may replace with or use together with the internal crack induction body 20, and may arrange | position the internal crack induction member 21 (FIGS. 9-11) mentioned later.

  Next, the mold 60 is placed at a predetermined position, and concrete is driven into the mold. After the concrete has hardened by disposing the projecting material 61 for forming the induction joint 50 (FIG. 8) at the position facing the convex portion 2 of the crack-inducing water-stopping member 1 in the mold 60, The external crack 41 (FIG. 8) can be easily generated at a predetermined position between the convex portion 2 and the outer wall surface.

  When the mold 60 is removed after the concrete is placed and cured in the mold 60, a thin portion of the concrete, that is, the external crack 41 as shown in FIG. The internal crack 42 is induced between the crack-inducing water-stopping member 1 via the crack-inducing body 20. By generating (inducing) cracks at predetermined locations in this way, it is possible to prevent a large number of cracks from occurring randomly.

  Even if the external crack 41 is left untreated, the adhesive coating layer 7 of the crack-inducing water-stopping member 1 can prevent water from entering the reinforcing bar 30, but it is sealed by injecting an appropriate joint agent (water-proofing agent) from the outside. By stopping, more reliable water stop can be achieved.

  On the other hand, a water-stopping agent is press-fitted into the internal crack 42 from a pump or the like (not shown) connected to the hole 4 of the crack-inducing water-stopping member 1 (for example, the recessed portion 9 and the annular protrusion 10 in which the hole 4 is enlarged). Then, a water-stopping agent is injected and filled from the opening 6 through the paper 8 and solidified to stop the internal crack 42. Reinforcing bars are the most important parts that are easily deteriorated due to water intrusion and must be protected. Therefore, water stopping around the reinforcing bars 30 is most important, and therefore, it is desirable that the water stopping agent spread over the entire internal crack 42. It is sufficient that at least cracks in the vicinity of the reinforcing bars around the crack-inducing water-stopping member 1 (including the gaps in the lower part of the horizontal reinforcing bars) can be stopped. As described above, according to the present invention, the penetration of water into the reinforcing bar 30 can be achieved from both the inside and outside by the crack-inducing water stop member 1 disposed on the reinforcing bar 30.

  The water-stopping agent may be either an inorganic water-stopping agent or an organic water-stopping agent as long as it has good fluidity and excellent water-stopping effect, and is not particularly limited. For example, a known permeable silica aqueous solution containing colloidal silica is suitable. This permeable silica-based water-stopping agent penetrates into the internal cracks in the ultrafine particles of silica, and reacts with the alkaline substances and hydrates in the concrete around the cracks to gel. Fill the crack with silica gel and stop water. In addition, it is possible to use urethane water-stopping agent or cement milk injected into the soil during tunnel excavation. However, it is desirable that it does not contain or generate an acid or chlorine that easily corrodes the reinforcing bar. The water-stopping agent for internal cracks and the joint agent for external cracks may be the same or different.

  Further, as shown in FIGS. 9 to 11, in order to further ensure that an internal crack is generated in the vicinity of the opening 6 of the crack-inducing water-stopping member 1 even when the concrete frame is thick, An internal crack inducing member 21 similar to that proposed as the inner crack inducing member 310 in Document 2 may be disposed inside the reinforcing bar. FIG. 9 is a schematic cross-sectional view of the crack-induced waterstop member 1 and the internal crack-inducing member 21 fixed to the reinforcing bar, and FIG. 10 is a schematic part of the fixed state of the internal crack-inducing member 21 fixed to the reinforcing bar. 11 is a perspective view, and FIG. 11 is a schematic cross-sectional view showing a state where the concrete frame is cured when the internal crack inducing member 21 is disposed.

  The internal crack inducing member 21 is provided on the inner side of the 30 reinforcing bars corresponding to the opening 6 of the crack-inducing water-stopping member 1 so that the water-stopping agent effectively flows into the internal crack from the opening 6 in the crack-inducing water-stopping member 1. It is fixed at the (concrete frame inside) position. The internal crack inducing member 21 is preferably a plate-like member because it is easy to direct the crack generation direction. A plate made of polyvinyl chloride is preferred. The size may be appropriately determined depending on the size of the concrete frame. Usually, however, if the total length of the crack-inducing water-stopping member 1 and the internal crack-inducing member 21 is 30% or more of the total thickness of the concrete frame, the inside is preferentially used. Cracks can be induced.

  The internal crack inducing member 21 may be fixed to the reinforcing bar 30 with a wire or the like. However, since it is sufficient if positioning is possible, simple fixing with a dedicated clamp 22 may be used.

  After the crack-inducing water-stopping member 1 and the internal-crack-inducing member 21, and in the case of a wall thickness, the internal crack-inducing body 20 is fixed and surrounded by a mold, and then concrete is cast and cured in the same manner as described above. By filling the outer cracks and the inner cracks, and also in the gaps in the lower part of the horizontal reinforcing bars with the water-stopping agent, it is possible to achieve even more reliable water-stopping.

It is a schematic cross section of one embodiment at the time of construction of a crack induction waterproofing member of the present invention. It is a schematic perspective view of one embodiment of a crack induction water stop member of the present invention. FIG. 3 is a partially omitted rear view of the crack-inducing water stop member of the present invention shown in FIG. 2. It is a general | schematic fragmentary perspective view of another embodiment of the crack induction water stop member of this invention. It is a general | schematic partial rear view of the crack induction water stop member of this invention shown in FIG. It is a general | schematic partial rear view of another embodiment of the crack induction water stop member of this invention. It is a schematic cross-sectional view of the structure of the present invention in an uncured state when concrete is placed. It is a schematic cross-sectional view of the state where the concrete housing of FIG. 7 is cured. It is a schematic cross-sectional view of the fixed state of the crack induction water stop member fixed to the reinforcing bar and the internal crack induction member. It is a general | schematic fragmentary perspective view of the fixed state of the internal crack induction member fixed to the reinforcing bar. It is a schematic cross-sectional view of the state in which the concrete frame is cured when the internal crack inducing member is disposed. It is a schematic cross-sectional view which shows the construction state of the conventional crack induction member described in patent document 1. FIG. 13 is a schematic cross-sectional view of a state where cracks are generated in the construction state shown in FIG. 12. It is a schematic cross-sectional view which shows the construction state of the conventional crack induction member described in patent document 2.

Explanation of symbols

1 Crack-induced water-stopping member
2 Convex parts
3 flat parts
4 holes
5 flat surface
6 opening
7 Adhesive coating layer
8 paper
9 recess
10 Annular protrusion
11 Small hole
20 Internal crack inducer
21 Internal crack-inducing member
22 Clamp
30 Rebar
31 Mounting members
40 concrete frame
41 External crack
42 Internal crack
50 Induction joint 60, 130 Formwork
61 Protruding material 100 Crack inducing member 101 Opposite pieces 102 and 103 Water stop material 110 Drainage channel 120 Wall reinforcement 131 Notch forming member 200 Concrete 201 Notch 202 Crack 300 Crack inducing member 301 Core material 301a Protruding portion 300b Flange portion 302 Adhesive layer 310 Inside Crack inducing member 400 structure 410 groove 420 structural reinforcing bar

Claims (8)

A crack-induced water-stop structure for a concrete structure including a reinforcing bar and a crack-induced water-stop member,
The crack-inducing water-stopping member is a long member having a T-shaped cross section, and a hole for injecting a water-stopping agent penetrating in the longitudinal direction of the long member is formed at the base of the T-shaped convex portion. 1 or 2 or more openings that communicate with the hole and the outside are provided on a flat surface that forms at least the T-shaped flat portion, and at least all surfaces other than the openings of the flat surface are made of concrete. It is a member covered with a coating layer of an adhesive material that is excellent in adhesion with
The opening is covered with paper that allows the water-stopper to penetrate but uncured concrete does not.
A crack-inducing water-stopping structure, wherein the crack-inducing water-stopping member is disposed in the vicinity of a reinforcing bar inside the concrete housing so that the convex portion of the member faces the outer surface of the concrete housing. The diameter of the hole is expanded at one end in the longitudinal direction of the crack-inducing water stop member, and an annular protrusion that can be inserted into the expanded hole is provided at the other end. Crack-induced water stop structure. The crack-induced waterstop structure according to claim 1 or 2, wherein the opening is one or more slits or one or more small holes. The crack-induced waterstop structure according to any one of claims 1 to 3, wherein an internal crack-inducing body is disposed in parallel to the crack-induced waterstop member at an inner central portion surrounded by the reinforcing bars of the concrete frame. The internal crack inducing body promoting body is disposed in parallel with the crack inducing water stopping member at a position facing the crack inducing water stopping member inside the concrete frame surrounded by the reinforcing bars. The crack-induced water stop structure described in Crab. As the concrete hardens, internal cracks are created inside the outer wall of the concrete frame and the inside of the concrete frame surrounded by the reinforcing bars. A crack-inducing water-stopping member,
It is a long member having a T-shaped cross section, and a hole for injecting a water-stopping agent penetrating in the longitudinal direction of the long member is formed in the base of the convex portion of the T-shaped, and at least the T-shaped 1 or 2 or more openings that communicate the hole and the outside are provided on a flat surface that forms a flat part of the material, and at least all surfaces other than the openings of the flat surface are excellent in adhesiveness to concrete A crack-inducing water-stopping member which is covered with a coating layer of material and whose opening is covered with paper which allows water-stopping agents to pass through but does not pass through uncured concrete. The diameter of the hole is expanded at one end in the longitudinal direction of the crack-inducing water stop member, and an annular protrusion that can be inserted into the expanded hole is provided at the other end. Crack-induced water-stopping member. The crack-inducing water-stopping member according to claim 6 or 7, wherein the opening is one or more slits, or one or more small holes.

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